#!/usr/bin/env python3
# SPDX-License-Identifier: (Apache-2.0 OR MIT)

import io
import json
import lzma
import sys
import os
from pathlib import Path
from timeit import timeit

import orjson
import simplejson
import ujson
import rapidjson
from tabulate import tabulate

os.sched_setaffinity(os.getpid(), {0, 1})


dirname = os.path.join(os.path.dirname(__file__), "data")


def read_fixture_obj(filename):
    path = Path(dirname, filename)
    if path.suffix == ".xz":
        contents = lzma.decompress(path.read_bytes())
    else:
        contents = path.read_bytes()
    return orjson.loads(contents)

filename = sys.argv[1] if len(sys.argv) >= 1 else ""

data = read_fixture_obj(f"{filename}.json.xz")

headers = ("Library", "compact (ms)", "pretty (ms)", "vs. orjson")

LIBRARIES = ("orjson", "ujson", "rapidjson", "simplejson", "json")

output_in_kib_compact = len(orjson.dumps(data)) / 1024
output_in_kib_pretty = len(orjson.dumps(data, option=orjson.OPT_INDENT_2)) / 1024

# minimum 2s runtime for orjson compact
ITERATIONS = int(2 / (timeit(lambda: orjson.dumps(data), number=20) / 20))

print(f"{output_in_kib_compact:,.0f}KiB compact, {output_in_kib_pretty:,.0f}KiB pretty, {ITERATIONS} iterations")

def per_iter_latency(val):
    if val is None:
        return None
    return (val * 1000) / ITERATIONS

def test_correctness(serialized):
    return orjson.loads(serialized) == data

table = []
for lib_name in LIBRARIES:
    print(f"{lib_name}...")
    if lib_name == "json":
        time_compact = timeit(
            lambda: json.dumps(data).encode("utf-8"), number=ITERATIONS,
        )
        time_pretty = timeit(
            lambda: json.dumps(data, indent=2).encode("utf-8"), number=ITERATIONS,
        )
        correct = test_correctness(
            json.dumps(data, indent=2).encode("utf-8")
        )
    elif lib_name == "simplejson":
        time_compact = timeit(
            lambda: simplejson.dumps(data).encode("utf-8"), number=ITERATIONS,
        )
        time_pretty = timeit(
            lambda: simplejson.dumps(data, indent=2).encode("utf-8"), number=ITERATIONS,
        )
        correct = test_correctness(
            simplejson.dumps(data, indent=2).encode("utf-8")
        )
    elif lib_name == "ujson":
        time_compact = timeit(
            lambda: ujson.dumps(data).encode("utf-8"), number=ITERATIONS,
        )
        time_pretty = timeit(
            lambda: ujson.dumps(data, indent=2).encode("utf-8"), number=ITERATIONS,
        )
        correct = test_correctness(
            ujson.dumps(data, indent=2).encode("utf-8")
        )
    elif lib_name == "rapidjson":
        time_compact = timeit(lambda: rapidjson.dumps(data), number=ITERATIONS)
        time_pretty = None
        correct = False
    elif lib_name == "orjson":
        time_compact = timeit(lambda: orjson.dumps(data), number=ITERATIONS)
        time_pretty = timeit(
            lambda: orjson.dumps(data, None, orjson.OPT_INDENT_2), number=ITERATIONS,
        )
        correct = test_correctness(
            orjson.dumps(data, None, orjson.OPT_INDENT_2)
        )
        orjson_time_pretty = per_iter_latency(time_pretty)
    else:
        raise NotImplementedError

    time_compact = per_iter_latency(time_compact)
    if not correct:
        time_pretty = None
    else:
        time_pretty = per_iter_latency(time_pretty)

    if lib_name == "orjson":
        compared_to_orjson = 1
    elif time_pretty:
        compared_to_orjson = time_pretty / orjson_time_pretty
    else:
        compared_to_orjson = None

    table.append(
        (
            lib_name,
            f"{time_compact:,.2f}" if time_compact else "",
            f"{time_pretty:,.2f}" if time_pretty else "",
            f"{compared_to_orjson:,.1f}" if compared_to_orjson else "",
        )
    )

buf = io.StringIO()
buf.write(tabulate(table, headers, tablefmt="grid") + "\n")

print(
    buf.getvalue()
    .replace("-", "")
    .replace("*", "-")
    .replace("=", "-")
    .replace("+", "|")
    .replace("|||||", "")
    .replace("\n\n", "\n")
)
